text: def add_prefix_un(word):
      """
  
      :param word: str of a root word
      :return:  str of root word with un prefix
  
      This function takes `word` as a parameter and
      returns a new word with an 'un' prefix.
      """
  
      pass
  
  
  def make_word_groups(vocab_words):
      """
  
      :param vocab_words: list of vocabulary words with a prefix.
      :return: str of prefix followed by vocabulary words with
               prefix applied, separated by ' :: '.
  
      This function takes a `vocab_words` list and returns a string
      with the prefix  and the words with prefix applied, separated
       by ' :: '.
      """
  
      pass
  
  
  def remove_suffix_ness(word):
      """
  
      :param word: str of word to remove suffix from.
      :return: str of word with suffix removed & spelling adjusted.
  
      This function takes in a word and returns the base word with `ness` removed.
      """
  
      pass
  
  
  def adjective_to_verb(sentence, index):
      """
  
      :param sentence: str that uses the word in sentence
      :param index:  index of the word to remove and transform
      :return:  str word that changes the extracted adjective to a verb.
  
      A function takes a `sentence` using the
      vocabulary word, and the `index` of the word once that sentence
      is split apart.  The function should return the extracted
      adjective as a verb.
      """
  
      pass
  